How to add properties Location to image

huynhk

I tried to use ExifInterface to set Location of image like this:

    public void Save(Bitmap bitmap, string filePath, GpsLocation location)
            {
                using(var stream = new MemoryStream())
                {
                bitmap.Compress(Bitmap.CompressFormat.Jpeg, 50, stream);

                if (location.Longtitude != null)
                {
                    ExifInterface newExif = new ExifInterface(filePath);
                    newExif.SetAttribute(ExifInterface.TagGpsLongitudeRef, location.Latitude);
                    newExif.SetAttribute(ExifInterface.TagGpsLongitudeRef, location.Longtitude);
                    newExif.SaveAttributes();
                }

                FileStorageHelper.WriteFile(filePath, Storage.External, stream.ToArray());
            }
        }

But it doesn't work, the image detail doesn't contain Location properties. Any ideas about this?

LasseMadsen

You need to save the image to the file path before saving the attributes, so this should do it

public void Save(Bitmap bitmap, string filePath, GpsLocation location)
{
   using (var stream = new MemoryStream())
   {
      bitmap.Compress(Bitmap.CompressFormat.Jpeg, 50, stream);

      FileStorageHelper.WriteFile(filePath, Storage.External, stream.ToArray());
   }

   if (location.Longtitude != null)
   {
      ExifInterface newExif = new ExifInterface(filePath);
      newExif.SetAttribute(ExifInterface.TagGpsLongitudeRef, location.Latitude);
      newExif.SetAttribute(ExifInterface.TagGpsLongitudeRef, location.Longtitude);
      newExif.SaveAttributes();
   }
}

LasseMadsen

You need to save the image to the file path before saving the attributes, so this should do it

public void Save(Bitmap bitmap, string filePath, GpsLocation location)
{
   using (var stream = new MemoryStream())
   {
      bitmap.Compress(Bitmap.CompressFormat.Jpeg, 50, stream);

      FileStorageHelper.WriteFile(filePath, Storage.External, stream.ToArray());
   }

   if (location.Longtitude != null)
   {
      ExifInterface newExif = new ExifInterface(filePath);
      newExif.SetAttribute(ExifInterface.TagGpsLongitudeRef, location.Latitude);
      newExif.SetAttribute(ExifInterface.TagGpsLongitudeRef, location.Longtitude);
      newExif.SaveAttributes();
   }
}

huynhk

It works for me, thanks @LasseMadsen